Improvement in fan-blowers



I. M. PHELPS.

Pan-Blower.

No. 206,129. Patented July 16., I878,

N PETERS. PHOTO-LITHDGRAPHER. WASHINGTON, D C.

UNITED STATES PATENT OFFICE.

IRA M. PHELPS, OF PHILADELPHIA,

PENNSYLVANIA, ASSIGNOR OF ONE- HALF HIS RIGHT TO JOHN SHILLITO, JR, OFSAME PLACE.

IMPROVEMENT lN FAN-BLOWERS.

Specification forming part of Letters Patent No. 206,129, dated July 16,1878; application filed April 16, 1878.

To all whom it may concern:

Be it known that I, IRA M. PHELPS, of Philadelphia, Pennsylvania, haveinvented a new and useful Improvement in Fan-Blowers, of which thefollowing is a specification:

The object of my invention is to construct a fan-blower which willimpart a greater pressure to the air than those in common use, and thisobject I attain in the following manner, reference being-had to theaccompanying drawing, in which Figure 1 is a longitudinal verticalsection of my improved fan-blower; Fig. 2, a sectional plan 011 the line1 2, and Fig. 3 an enlarged View of part of the device.

The casing A of the blower is of the usual form, and has adischarge-nozzle, b, at the base, and in one side a centralinlet-opening, to which, in the present instance, is tightly fitted afunnel, a. Within the casing A is arrangeda wheel, B, the shaft d ofwhich is adapted to a bearing, e, in the back of the casing, and thiswheel B has hollow arms f, (three in the present instance,) whichcommunicate with the hollow hub 2' of the wheel, the said hub being openat one side, so as to receive the inner end of the funnel a, whichprojects beyond the inside of the casing A, so as to form an annularflange, m.

The opening in the hub i is somewhat larger in diameter than the saidflange 112, so that an annular space, a, intervenes between the two, asshown more fully in Fig. 3.

On the front of each of the arms f is a blade, 10, which, in the presentinstance, projects beyond the sides of the arm, and also beyond the endof the same, as shown in Figs. 1 and 2.

then the wheel B is revolved rapidly in the directions of the arrows 1,air will enter the hollow hub i through the funnel a, and this air willpass through the hollow arms f with a force due partly to centrifugalaction, and partly to the partial vacuum existing immediately in therear of the projecting portions of the rapidly-moving blades 20.

The air which thus enters the casin g is acted upon by the succeedingblade, and is thereby forcibly driven out through the dischargenozzle b.

By means of the hollow arms f the air is at once conveyed to a pointwhere it is directly in the path of the blades, so that the full blowingor fanning effect of the latter is utilized.

As the funnel a fits tightly in the opening in the casing A, all leakageof air at the inlet is prevented, any air which passes between the outerface of the wheel B and the casing A being directed by the projectingflange m of the funnel a into the hub i through the an nular space a, sothat it does not interfere with the free inlet of air through the openmga.

By allowing the space a to intervene between the edge of the opening inthe hub of the wheel B and the funnel a, I overcome the friction whichwould be caused by a contact of these two surfaces.

The blades to need not in every case project beyond the ends of the armsf, nor even beyond the sides of the same-for instance, the arms might bemade of such a width that they would themselves form blades without anyaddition. The form shown, however, is preferred.

I claim as my invention- 1. The combination of the casing A,ha\'ing aninlet and outlet, with the wheel B, having a hollow hub, i, and hollowarms j, which afford communication between the hollow hub and theinterior of the casing, and the fronts of which form or carrytanning-blades, all substantially as set forth.

2. The combination of the wheel B and its hollow arms f, open at theouter ends, with blades 10, projecting beyond the ends of the arms, asspecified.

3. The combination of the wheel B, having a hollow hub, '2', the casingA, and the annular flange at around the inlet-opening, as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

IRA M. PHELPS.

\Vitnesses:

HARRY A. CRAWFORD, HARRY SMITH.

